JPS599481B2 - Fluid purification method and purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sulfur dioxide gas generator, and more specifically to industrial equipment that requires sulfur dioxide gas, particularly sewage purification equipment, etc.
The object of the present invention is to provide a sulfur dioxide gas generator that can directly supply the gas without using an intermediate storage tank or the like, following fluctuations in its consumption.

It is already known that a wastewater treatment method using sulfur dioxide gas and iron is used for sewage treatment.

For example, treatment methods and equipment that use sulfur dioxide gas and scrap iron to treat wastewater from domestic sewage pipes include:
U.S. Patent No. 3,52, issued on July 8, 1970
No. 1,752 and No.3,522,173 by the inventor of the present invention.

The process disclosed in these U.S. patents involves passing the feedstock horizontally through an elongated tank along its length and passing a mixture of gaseous oxygen and sulfur dioxide gas through holes or manifolds disposed along the length of the tank. The mixture is pressurized and injected simultaneously to control the mixture and adjust the acidity within the primary reaction chamber.

This manifold, which injects a gas mixture, leads to a secondary reaction chamber filled with scrap iron that receives the feed stream from the primary reaction chamber, and the treated fluid is then neutralized, settled, and filtered. The process is continuous.

U.S. Pat. No. 2,171,203 also discloses a sulfur dioxide iron oxidation process by Urbein and Stemmen.

The purification mechanism using sulfur dioxide gas and iron is as follows.

That is, the sulfur dioxide gas in the solution medium in the first acid treatment tank becomes sulfur dioxide.

Thereafter, the sulfite is converted into ferrous sulfite and free electrons in the presence of metallic iron as shown in the chemical formula below.

Q2+2 (H2 803)+2Fe=2FeSO3+2H20+4e The electrons in this mixture contribute significantly to the continuous suspension of the material which ultimately becomes solid at a final pH value of about 3.

The gas mixture recovered from the top of the iron treatment tank (for recirculation) at this stage is a mixture of hydrogen sulfide, carbon dioxide, sulfur dioxide gas, and water vapor.

The oxidized feedstock is neutralized and, if necessary, further treated with sulfur dioxide gas, then neutralized with lime and brought into contact with a gas stream containing gaseous oxygen (preferably supplemented with ozone) and placed in a condensation chamber. sulfate (CaSO4 + Fe2 (804
) to keep iron and sulfite in solution in suspension.

A stable supply of sulfur dioxide gas is essential for such purification methods and equipment, but conventionally, sulfur dioxide gas production is performed in a location far away from the sulfur dioxide gas usage site and that continuously produces sulfur dioxide gas in large quantities. Sulfur dioxide gas from the plant was filled into cylinders or tank cars, transported to the site of use, and stored in tanks for use.

This conventional method requires a large-capacity sulfur dioxide gas tank as part of the purification device, and has the inconvenience of having to frequently replenish the tank with sulfur dioxide gas.

On the other hand, when trying to incorporate a sulfur dioxide gas generator into a part of the purification equipment, it is important to note that with conventional sulfur dioxide gas generators, when the equipment is stopped, the molten sulfur in the piping solidifies, Since the system cannot be started, it has to be operated continuously, and there are problems in that it cannot keep up with fluctuations in the amount of sulfur dioxide gas required in the purification system.

The present invention aims to provide a sulfur dioxide gas generator that can directly supply sulfur dioxide gas according to the amount of sulfur dioxide gas consumed in an industrial process without requiring a storage tank. It is an object of the present invention to provide a sulfur dioxide gas generating device that is relatively small and can be used as a part of a purification device and can follow fluctuations in the amount of sulfur dioxide gas consumed in the purification device.

The sulfur dioxide gas generator of the present invention conveys powdered sulfur using pressurized air into a combustion chamber, and burns the sulfur in this chamber to generate sulfur dioxide gas. a combustion chamber for combusting powdered sulfur, and a conduit member connected from the hopper to the combustion chamber for conveying powdered sulfur from the hopper to the combustion chamber, and from the hopper into the conduit member and to the nozzle. a valve member disposed within the conduit member for controlling the flow of powdered sulfur conveyed through the hopper; a vibrating grid for screening particulate sulfur discharged from the hopper into the conduit member; a vibrating member coupled to simultaneously vibrate both of said vibrating grids to control the flow of separated sulfur particles from said hopper and powdered sulfur conveyed into a combustion chamber to produce gaseous sulfur dioxide gas; and an outlet for removing sulfur dioxide gas from the combustion chamber, the conduit member including a nozzle in communication with the combustion chamber and a source of pressurized air, the pressurized air directing powdered sulfur through the conduit member. It is configured to be transported from the combustion chamber to the combustion chamber.

Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a partially vertical front view showing an embodiment of the sulfur dioxide gas generator of the present invention.

The powdered sulfur contained in the moisture-proof hopper H passes through a vibrating grid, or shifter 149, and is dropped little by little into the lateral fluid passage 127 by a perforated metering plate 161 that is slowly rotated by a motor M.

The feed rate of powdered sulfur, and thus the size of the holes in the metering plate 161, is varied by a slidable valve member V sliding on the metering plate 161.

An electric vibrator 148 fixed to the side wall of the hopper simultaneously vibrates the hopper and the shifter 149 so that the powdered sulfur can be quantitatively and smoothly fed.

A blower 144 is attached to one end of the fluid passage 121 to supply pressurized air, and the other end, ie, the outlet of the nozzle, opens into the combustion chamber 129 .

The combustion chamber 129 is shaped to create and promote swirling of some of the fluids entering the chamber, thereby providing intimate mixing within the combustion chamber.

Gas burner 145 injects combustion gas into combustion chamber 129 where it ignites a swirling mixture of sulfur dust and gaseous oxygen to form sulfur dioxide gas and sulfide slug, which is removed through outlet 133 and sulfurized. The slug falls through perforated wall 166 into collection chamber 131 .

The injection of combustion gases by gas burner 145 is electronically regulated by temperature sensor 171 in combustion chamber 129 and controller 206 .

The flow rate of powdered sulfur is typically about 1 pound per minute (approximately 0.4
5 Ky) to about 20 pounds (about 9K9).

Fluid passageway 127 is centrally located in generally circular water jacket 125 and is cooled by water supplied from conduit 147 and drained through conduit 146 through the interior of water jacket 125 .

The function of the cooling water jacket 125 is to keep the powdered sulfur well below its melting point so that the particles do not condense and therefore do not stick or stick to each other in the form of a mixture with the oxygen in the air from the blower. Combustion chamber 12 without wearing
Sent into 9.

The temperature of the combustion chamber is about 232°C (about 450 below) (or about 93°C to about 316°C (about 200'F to about 60°C)).
0'F)), whereas generally the water jacket 12
The temperature in step 5 is about 32°C to 35°C (about 90 below to 95'F).
).

This water jacket 125 likewise prevents the combustion zone from propagating into the fluid passage 127 and further into the hopper H.

Blower 144 is also controlled by controller 205 which is electronically sensitive to sulfur dioxide gas pressure at outlet 133.

The combustion chamber 129 has two conical parts 1 of equal size.
72, 173, and the larger ends of the conical portions are welded together along line 174 so that the conical portions are located facing each other along a substantially horizontal axis, so that the inside of the combustion chamber is The internal conical reflective wall of the sulfur gas passage 127 allows for efficient mixing of the air and sulfur from the fluid passageway 127 with the combustion gases from the gas burner 145.

However, there is a bulge in the center, and the inlet 127
, 145 and located horizontally away from the inlets, end walls (conical sections) more or less angled with respect to each other push back the two gas flows introduced from the inlets 127, 145 in a mixed form. Other shapes of combustion chambers may be used, with the top and bottom end walls corresponding to the top and bottom end walls on FIG.

The generated sulfur dioxide gas is directly supplied from outlet 133 through line 143 to a process that requires sulfur dioxide gas, such as a sewage purification system.

It may be supplied to a reserve storage tank 26 if necessary.

If the amount of sulfur dioxide produced exceeds the amount required for the process, the pressure within the combustion chamber increases and the controller 205 is activated to automatically reduce or stop the blower 144.

When the gas burner 145 is to be stopped, the gas burner 145 is also stopped by electronic control at the same time.

Or, pH in processes that require sulfur dioxide gas.
The value may be measured with an electronic pH meter, and the pH meter and controller 205 may be linked to control the amount of sulfur dioxide gas generated.

Alternatively, the controller 205 can also control the valve member (2) together with (or separately) the blower 144.

Of course, it is also possible to manually control the amount of sulfur dioxide gas required in the process without using such automatic electronic control.

Such control is possible because the sulfur dioxide gas generator of the present invention uses powdered sulfur as a raw material and controls the flow of powdered sulfur by vibrating the hopper and grid. Quantitative performance is good even in the case of This is due to the fact that almost no sulfur remains in the nozzle portion of No. 127, and this sulfur does not melt or solidify to cause blockage of the nozzle.

FIG. 2 is a schematic diagram of a process showing an embodiment in which a sulfur dioxide gas generating device according to an embodiment of the present invention is incorporated into a part of a sewage purification device.

The raw material to be purified is fed through line 10 to a stainless steel aeration tank 16 where it is agitated and aerated by air supplied from line 20 and dispersed by manifold 18.

The supplied air is exhausted through a filter device 22 filled with charcoal which is kept constantly moist.

A decolorizing substance is supplied from the tank 91.

The vented fluid is sent by pump 19 through line 21 to a spherical cyclone acid treatment chamber 24 .

The outflow amount is regulated by a float control switch 15 and a valve located in the bypass line of the pump 19.

Fluid from the vent tank 16 is introduced into the acid treatment chamber 24 through an inflow nozzle 25 installed tangentially to the acid treatment chamber 24 along with sulfur dioxide gas and air (including recycled sulfur dioxide gas) from line 13. be done.

The introduction of fresh sulfur dioxide gas from line 13 is regulated by electronic controller 29 which is responsive to monitoring by pH detector 30, which also controls the flow of fresh water into acid treatment chamber 24 (not shown). , thus maintaining the pH value of the agitated fluid mixture within acid treatment chamber 24 between about 24 and about 2.6.

If the introduced fluid already has a pH close to or below 2.5, the function of the acid treatment chamber 24 is to saturate the fluid with sulfur dioxide gas.

A small flow is continuously withdrawn from the acid treatment chamber 24 by a bleed tube 32, passed through a pH detector 30, and then introduced through line 33 into the next iron treatment chamber 36.

The iron processing chamber 36 is closely packed with pieces of scrap iron approximately 1/2 x 6 inches in size.

The acid-treated feedstock is continuously withdrawn from the bottom of the acid treatment chamber 24 via line 34 and introduced into the bottom of the adjacent tower-shaped iron treatment chamber 36.

At the same time, a gas stream consisting of unreacted sulfur dioxide gas, oxygen-depleted air, and even other gases containing water vapor is continuously withdrawn from the exhaust bell of the acid treatment chamber 24 and passed through line 35 to the iron into the lower injection manifold 37 within the processing chamber 36 and into the iron processing chamber 3.
At 6, the feedstock and gaseous mixture are mixed again and moved together upwardly through the shingle layer.

The treated fluid is drawn from the acid iron treatment chamber 36 via line 38 extending downwardly and into line 49.
The sodium hydroxide introduced from the spherical neutralization chamber 56 is injected by air introduced from the line 57 through an inflow throat 47 placed tangentially in the spherical neutralization chamber 56 .

As a result, a vortex is generated within the neutralization chamber 56, and mixing is performed.

A detector and electronic controller 53 control the amount of sodium hydroxide introduced through line 49.

Exhaust air is drawn from an exhaust bell at the top of the neutralization chamber 56 via line 61, and is passed through a homogenizer to be described below.
Together with the exhaust air from 65, it is recycled to line 20, for example as air for the ventilation tank 16.

The neutralized fluid is then passed through line 71 to sulfur dioxide gas treatment chamber 140 where sulfur dioxide gas from line 141 of the closed circuit is introduced via nozzle 142.

The nozzle 142 is also supplied with fresh sulfur dioxide gas from the sulfur dioxide gas generator G via a line 143.

A pH detector and electronic controller 54 controls valve 175 to maintain the pH value within chamber 140 at approximately 2.5.

The fluid treated with sulfur dioxide gas is passed from the chamber 140 via the line 48 to the inlet 63 and then to the spherical homogenizer.
Introduced in 65.

Calcium hydroxide is introduced into line 48.

Air is introduced into the inlet 63 from a line 64 so that each stream is injected into a homogenizer 65 and mixed.

Thereafter, purified water is obtained through predetermined steps as required.

Acid treatment chamber 24 and sulfur dioxide gas treatment chamber 1
The sulfur dioxide gas introduced into 40 is supplied by the sulfur dioxide gas generator G described in detail with reference to FIG.

In such a sewage purification apparatus, the amount of sulfur dioxide gas required changes due to changes in the quantity or properties of the feed material, so the sulfur dioxide gas generating apparatus of the present invention is effective in such cases.

That is, if the pH value of the sulfur dioxide gas treatment chamber 140 drops more than necessary, the electronic control device closes the valve 17.
5 is controlled, and the flow of sulfur dioxide gas into the nozzle 142 is restricted.

If the amount of sulfur dioxide gas flowing into the acid treatment chamber 24 is controlled at a constant level using a metering valve or the like, the flow into the nozzle 142 will be restricted, and the pressure within the combustion chamber 129 of the sulfur dioxide gas generator will increase. The controller 205
is detected, and the amount of air blown by the blower 144 and the opening degree of the valve member V are limited.

Although the sulfur dioxide gas generator of the present invention has been described above in connection with sewage treatment, the present invention is not limited to this application, and can of course be applied to other processes in which sulfur dioxide gas is useful. be.

Desirable embodiments of the present invention are listed below.

(a) the combustion chamber is comprised of a pair of conical sections, the bottom edges of each conical section facing each other and resting on a substantially horizontal alignment axis, and the nozzle and the sulfur dioxide gas outlet are disposed at the top of each conical section, respectively; A sulfur dioxide gas generator according to the claims.

(l)) The sulfur dioxide gas generating device according to item (aQ), wherein a perforated wall is provided below the cone facing the inlet of the nozzle to allow the sulfur slang produced in the combustion chamber to pass through.

(C) The member for combusting the powdered sulfur is a burner communicated with the combustion chamber to introduce a flame into the combustion chamber in an amount sufficient to initiate and maintain combustion of the sulfur. A sulfur dioxide gas generator according to the scope of the above.

(d) The sulfur dioxide gas generator according to claim 1, wherein the conduit member is provided with a cooling device for preventing condensation of powdered sulfur within the conduit member.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical front view showing an embodiment of the sulfur dioxide gas generator of the present invention, and FIG. 2 is an embodiment in which the sulfur dioxide gas generator of FIG. 1 is incorporated into a part of a sewage purification device. FIG. 125...Water jacket, 127...
Fluid passage, 129... Combustion chamber, 131
...Collection chamber, 133...Outlet, 144...Blower, 145...Gas burner, 148...Electric vibrator, 149・
...Shifter, 161...Perforated measuring plate, 166...Perforated wall, 172,173...
... Conical part, H ... Hopper, ■ ...
・Valve parts.

Claims (1)

[Scope of Claims] 1. A hopper for storing powdered sulfur raw material, a combustion chamber for burning the powdered sulfur, and a hopper and the combustion chamber for transporting the powdered sulfur from the hopper to the combustion chamber. a conduit member connected to the combustion chamber, the conduit member including a nozzle in communication with the combustion chamber and a source of pressurized air for conveying powdered sulfur from the noise to the combustion chamber by the pressurized air; a valve member disposed within the conduit member for controlling the flow of powdered sulfur from the hopper into the conduit member and into the nozzle; a vibrating grid for screening particulate sulfur; a vibrating member coupled to simultaneously vibrate both the hopper and the vibrating grid to control the flow of separated sulfur particles from the hopper; and producing gaseous sulfur dioxide gas. A sulfur dioxide gas generator comprising: a member for burning powdered sulfur conveyed to the combustion chamber for the purpose of combustion; and an outlet for taking out sulfur dioxide gas from the combustion chamber.